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촉매연소기용 귀금속 촉매와 조촉매의 열적 내구특성 연구
최병철,고병운,김명환,신혁,Choi, Byungchul,Ko, Byeongwoon,Kim, Myeonghwan,Sin, Hyeok 한국교통대학교 융복합기술연구소 2020 융ㆍ복합기술연구소 논문집 Vol.10 No.1
The purpose of the study is to investigate the thermal durability characteristics of the Pt catalyst and additives used in a catalytic combustor. The catalyst used in the experiment was based on Pt (3 wt%), and a total of 12 types were prepared using a combination of additives (Ni, La, Ce, Fe, and Co). From the results, In the fresh state, the two types of combination catalysts with the highest C<sub>3</sub>H<sub>8</sub> conversion were Pt_Ce (79.9%) at 500℃, and in the three types of combination catalysts, Pt_La_Ni (93.4%) at 500℃ had the best performance. Among aged catalysts at 850℃ and 8 hours, Pt-La-Ni and Pt-Ni-Ce catalysts showed the highest C<sub>3</sub>H<sub>8</sub> conversion of about 71% at 500℃.
초음파와 전기전도 센서를 이용한 우레아 탱크 수위, 농도 및 온도의 동시 측정 방안
최병철(Byungchul Choi),김태욱(Taewook Kim) 한국동력기계공학회 2017 동력시스템공학회지 Vol.21 No.5
The purpose of this study is to propose the basic data for the development of a sensor capable of simultaneously measuring the liquid-level, concentration and temperature of a urea tank using ultrasonic and electrical conductivity sensors for diesel vehicles with a urea-SCR system. It was found that the liquid-level of the urea tank using the ultrasonic sensor showed a good linearity with the actual liquid-level, and the urea concentration maintained good linearity in the range of 32.5 wt% to 10 wt%. It was an effective measurement of urea concentration to use the electrical conductivity sensor in the temperature range of –10~22℃ and to use the ultrasonic sensor at 22℃ or more. Simultaneous measurement of concentration, liquid-level and temperature of the urea tank will be possible by attaching the electrical conductivity sensor and the ultrasonic sensor (split-type) to one sensor together.
최병철(Byungchul Choi),이춘희(Choonhee Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study investigates the aging characteristics of NOx storage reduction catalyst on the emission conditions of lean bum natural gas vehicles. For the increases of surface area and thermal durability performance of the catalyst, we designed various catalysts with the double-layer washcoat. The experiments were conducted with 3 kinds of NOx storage catalysts, which were manufactured with a honeycomb cordierite substrate. It was found that Ba is weak in the thermal aging because it is lower melting temperature than precious metals (PM), and the suitable loading amount of Ba should be about 42 g/L, from the results of the NOx adsorption and the NOx reduction efficiency. The major reason in decreasing the reduction efficiency of the NOx reduction catalyst is the decrease of the adsorption site owing to the agglomeration and sintering of Ba rather than PM form the hydrothermal aging. It was confirmed by results of BET, SEM and TEM.
온실용 축열 연소기형 이산화탄소 발생기의 배기 및 열회수 특성
최병철(Byungchul Choi),이정현(Jung-Hyun Lee) 한국동력기계공학회 2014 동력시스템공학회지 Vol.18 No.4
The purpose of this study is to evaluate the performance of after-treatment equipment and thermal storage devices for a heat recovery and combustor-type CO₂ generator fuelled a kerosene. To reduce the levels of harmful exhaust gases produced by a CO₂ generator, a catalyzed particulate filter(CPF) has been selected as an after-treatment device, by considering back pressure and exhaust gas temperature. The CO conversions of the catalyzed SiC filter(full plugging) were 92%, and the concentration of PM(particulate matter) was near ambient. A thermal recovery device was used to recover 13% of the heat energy from the exhaust gas through heat exchangers installed on the exhaust line of the CO₂ generator. 69% of the moisture within the exhaust gases was removed by condensing water, in order to minimize excessive humidity within the greenhouse.
저온 플라즈마-광촉매장치용 SIC 담체-촉매의 카본 산화특성
최병철(Byungchul Choi),강한용(Hanyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
PM oxidation behavior of some kinds of catalysts that were coated on the SiC substrate were investigated for Non-Thermal Plasma Discharge- Photocatalyst(NTPDP) system. The catalyst samples were prepared with double layer coating method that consisted of the P25(photocatalyst, bottom layer) and metal additives(upper layer). Carbon(Printex-U) as diesel soot was coated on the SIC honeycomb monolith with catalyst. P catalyst was observed better behavior to complete carbon oxidation in non application of the NTPDP system, and Ni catalyst was better at partial oxidation at same condition. Ni catalyst had some advantageous that carbon oxidation effectively oxidized at 250℃ and NOx reduction was reached about 15~20% at 370℃ in application of the NTPD. Moreover Ni catalyst provides stable operation of the NTPDP system. The SIC substrate has a good thermal durability that it can endures an arc discharge during transient plasma discharge.